Schwarze B V, Uhlarz M, Hornung J, Chattopadhyay S, Manna K, Shekhar C, Felser C, Wosnitza J
Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany.
J Phys Condens Matter. 2022 Aug 22;34(42). doi: 10.1088/1361-648X/ac87e5.
PtGa is a topological semimetal with giant spin-split Fermi arcs. Here, we report on angular-dependent de Haas-van Alphen (dHvA) measurements combined with band-structure calculations to elucidate the details of the bulk Fermi surface of PtGa. The strong spin-orbit coupling leads to eight bands crossing the Fermi energy that form a multitude of Fermi surfaces with closed extremal orbits and results in very rich dHvA spectra. The large number of experimentally observed dHvA frequencies make the assignment to the equally large number of calculated dHvA orbits challenging. Nevertheless, we find consistency between experiment and calculations verifying the topological character with maximal Chern number of the spin-split Fermi surface.
PtGa是一种具有巨大自旋分裂费米弧的拓扑半金属。在此，我们报告了与能带结构计算相结合的角度依赖德哈斯 - 范阿尔芬（dHvA）测量，以阐明PtGa体费米面的细节。强自旋 - 轨道耦合导致八个能带穿过费米能，形成了具有封闭极值轨道的多个费米面，并产生了非常丰富的dHvA光谱。大量实验观测到的dHvA频率使得将其与同样大量计算出的dHvA轨道进行匹配具有挑战性。尽管如此，我们发现实验与计算之间的一致性，验证了自旋分裂费米面具有最大陈数的拓扑特性。
